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Note also that most pump hardware won't deal with pure alcohol. I run smurf piss as well, and the Aquamist folks specifically warn against running *any* ethanol, or more than 50% methanol.
You want to start pumping at about 7-8psi so that you have a good mist going by the time you hit full boost. And as for your knock count, you need to get a couple of counts further down (below 7) and then you'll start to see the benefits as the ECU will then be advancing your timing.
It's enough though that you've cut knock in half - you've greatly increased your safety margin right there.
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